Messages in this thread | | | Date | Wed, 5 Jan 2011 19:07:34 +0000 | From | Russell King - ARM Linux <> | Subject | Re: still nfs problems [Was: Linux 2.6.37-rc8] |
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On Wed, Jan 05, 2011 at 01:55:05PM -0500, Trond Myklebust wrote: > On Wed, 2011-01-05 at 18:27 +0000, Russell King - ARM Linux wrote: > > I do still think you need _something_ there, otherwise data can remain > > in the direct map alias and not be visible via the vmap alias. I don't > > see that we have anything in place to handle this at present though. > > Is that perhaps what flush_kernel_dcache_page() is supposed to do?
Well, given how we have things currently setup on ARM, this ends up being a no-op - as new page cache pages are marked dirty and their flushing done at the point when they're mapped into userspace.
I guess we could do the flushing there and mark the page clean, but it'd need some careful examination of various code paths to confirm that it's safe - we may be avoiding this because some ARM arch versions need to manually IPI cache flushes to other cores (which can only be done with IRQs enabled.)
So, I don't think it'll do at the present time.
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